Disadvantages of Keyed Couplings

• Key-ways is not recommended if it requires to alternate the directional loads and shocks.

• Key-ways create shaft imbalance.

• The shaft strength tends to reduced due to the extra depth of the key-ways.

• The assembling and disassembling of the coupling onto the shaft gets lengthy and strenuous. There are high chances that the shaft may get damaged during the dismantling process adding cost.

• Expensive – As the key-way needs to be machined on both the shaft and the coupling.

• Key-ways reduce the capacity to transmit the power.

• There is no axial movement between the shaft and the hub.

• The keyed joints are over dimensioned – since it is difficult to calculate accurately.